Search found 5449 matches

by mediatechnology
Tue Oct 26, 2010 2:54 pm
Forum: The Peabody Lounge
Topic: is it just me
Replies: 8
Views: 16781

Re: is it just me

Wasn't it the UV reacting with CFCs that was going to end life as we know it? :D With UV declining does this mean we can start using real Freon cleaners again? "They [the solar cycles] are contributing nothing to long-term global warming," she said, "and it has no bearing on what we u...
by mediatechnology
Tue Oct 26, 2010 1:41 pm
Forum: The Peabody Lounge
Topic: is it just me
Replies: 8
Views: 16781

Re: is it just me

Seems fast to me too. Not ready for Summer/Indian Summer to end.
by mediatechnology
Mon Oct 11, 2010 1:39 pm
Forum: Pro Audio Design
Topic: console grounding
Replies: 12
Views: 20461

Re: console grounding

I think you may want to tie everything to ground. Now that this thing has become an SE version (with both halves of the 1570 doing both L&R) there's no virtual ground summing node for the - leg. That just occured to me. With CM rejection only being realized in the 1240, the source impedance feed...
by mediatechnology
Mon Oct 11, 2010 12:20 pm
Forum: Pro Audio Design
Topic: console grounding
Replies: 12
Views: 20461

Re: console grounding

Yes a direct path to ground. The VCA should go directly to ground and most other nodes as well. I'd use that extra pin and tie a resistor from it to ground. That build-out resistor would feed the - leg of the bus. Have you also looked at connecting pins 3 of the 1240s (U3 and U6 after the 1570) to t...
by mediatechnology
Mon Oct 11, 2010 11:57 am
Forum: Pro Audio Design
Topic: console grounding
Replies: 12
Views: 20461

Re: console grounding

I don't think you want R18 where you have it. I think that node needs to be ground (R18=0R). You may need another pin on the connector. I really need to look at the dwg on a printed copy. EDIT - What I meant by "quasi-balanced" is that only the + leg was driven. They couldn't field modify ...
by mediatechnology
Mon Oct 11, 2010 11:48 am
Forum: Pro Audio Design
Topic: console grounding
Replies: 12
Views: 20461

Re: console grounding

FYI drawings don't auto scale here. I can't remember if it's broken or a board mod is required. I try to limit mine to 700 pix or so. I'll save your drawing off-line so I can look at it.
by mediatechnology
Mon Oct 04, 2010 9:44 am
Forum: Document
Topic: dBx 3BX Three Band Dynamic Range Expander
Replies: 8
Views: 18809

Re: dBx 3BX Three Band Dynamic Range Expander

There is a second page I need to post with PSU and metering I had forgotten about.

It was early 1970's era.
by mediatechnology
Sun Oct 03, 2010 10:28 am
Forum: Document
Topic: Electronic Design IFD: JFET Curve Tracer
Replies: 1
Views: 5633

Electronic Design IFD: JFET Curve Tracer

Simple Circuit Turns Scope, Function Generator Into JFET Curve Tracer:

https://www.electronicdesign.com/displa ... rve-tracer

Image
by mediatechnology
Wed Sep 29, 2010 1:44 pm
Forum: Pro Audio Design
Topic: Channel and Output fader implementation
Replies: 5
Views: 10458

Re: Channel and Output fader implementation

Thanks JR. I suppose another advantage of fully-balanced might be 6 dB more headroom.
by mediatechnology
Tue Sep 28, 2010 1:06 pm
Forum: Pro Audio Design
Topic: Channel and Output fader implementation
Replies: 5
Views: 10458

Re: Channel and Output fader implementation

Sean - Thank you for joining us! Here's a post where we discuss using VCAs whose current outputs are directly summed into the mix amp: http://www.proaudiodesignforum.com/forum/php/viewtopic.php?f=6&t=211 IIRC the thread meanders a bit but at 16 pages it should keep you reading for awhile. There ...